Foldable hoist



K. w. cUsE FOLDABLE HOIST Feb. 7, 1956 Filed April 30, 1952 4Sheets-Sheet l Feb. 7, 1956 K. w. coUsE 2,733,817

FOLDABLE HOIST Filed'ADIl 30, 1952 4 Sheets-Sheet 2 Vs i BY M

Feb. 7, 1956 K. w. cousE 2,733,817

FOLDABLE HOIST Filed April 30, 1952 4 Sheets-Sheet 3 BY M Feb. 7, 1956Filed April 30. 1952 K. W. COUSE FOLDABLE HoIsT 4 Sheets-Sheet 4 UnitedStates Patent yf() FOLDABLE Horsr Kibbey W. Couse, Newark, N. I.Application April 30, 1952, Serial No. 285,262 1 claim. (c1.` 212-8) Myinvention relates to a foldable hoist and has as its prime object theprovision of a foldable hoist having a boom which is swingable from oneside of its supporting structure to a horizontal or nested position onthe other side of the supporting structure and wherein the supportingstructure for the boom is swingable vto a4 horizontal or nested positionopposite from that of the boom.

it is another object of rny invention to provide a foldable hoistwherein the mechanism for operating the boom and for lifting loadscarried by the boom may be operated by a small portable tool from a'single location and by one man,

It is another object of my invention to provide a foldable hoist of thedescribed type in which the operating mechanism is provided with meansfor holding such mechanism against the weight -of the boom and .anyloads carried by it with the power disconnected. v

Other objects and `advantages of my invention will become apparent asthe course of the specilication progresses. t

To attain the objects and advantages of my invention, I provide afoldable hoist having aboom Vand a support- 2,7 3 3 ,8 l 7 lit-atentedFby', 1956 2 Referring to the drawings, reference character 1 designatesa V-shaped boom comprising members 2 and 3 converging at one end anddiverginglat the opposite end of the boom. The diverging ends of members2 and 3 are pivotally connected at 4 to a base plate 5 which is shownsecured to foundation 6. Also pivotally connected at y4 to base plate 5is a supporting frame 7 which is secured in a normal operating positionby brace members 8 which ice are pivotally connected to foundation 6 andto opposite sides 9 and 10 of supporting frame 7. Boom 1 is swingableabout its pivotal axis from one side of supporting frame 7 in its normaloperating position over and about the supporting frame to a horizontalposition; onits other side. t l

Supporting frame 7 has a windlass 51 mounted thereon for raising and`lowering the boom, whichwindlass` comprises a drum 20 rotatably mountedin frame 7, a gear wheel 21 operatively connectedto drum 20, and a wormgear 22 positioned for coaction with gear wheel 21. The windlass isconnected with boom 1 by suitable .block and tackle gear comprising aline 23 which is secured to drum 20, a block pulley 24 pivotallyconnected at 25 to a triangular shaped plate 26 which is pivotallymounted at the diverging ends of boom` 1, and a block pulley 27 which ispivotally connected to members 28 which in turn are pivotally connectedtoopposite members 9 and 10 of frame 7. Line 23 extends from-drumli)over block pulley 20 is rotated in a counterclockwise `direction'.

ing structure for the boom both of which are pivotally p axis with theboom in its nested position from the normalV operating position to aVhorizontal Aposition opposite from that Vof the boom. Suitablemechanism is provided for operating the boom and for raising `andlowering any load carried by the boom. This mechanism is adapted foroperation by a portable hand tool and incorpo-rates a worm and gearwheel drive for holding the mechanism against the weight of the boom andany load carried b the boom with the power removed.

l shall describe one form of my invention and point out the novelfeatures thereof in claim.

In the accompanying drawings, Fig. l is a perspective View of thefoldable hoist showing the boom being raised on one side of thesupporting structure.

Fig. 2 is a perspective view of the foldable hoist with the boom beinglowered on the other side of the supporting structure.

Fig. 3 is a perspective view of the foldable hoist with the boom in itsnested position and with a supporting structure being lowered into ahorizontal position opposite from the boom.

Figs. 4 through 9 are side elevational views of the foldable hoistshowing the boom in progressive stages of its operation from one side ofthe supporting structure to a nested position on the other side andshowing the supporting structure being operated to its horizontalposition with the boom in its nested position.

Fig. l0 is a top plan view of the boom and supporting structure in theirhorizontal positions with the block and tackle gear removed.

24 and over block pulley 27 back to pulley 24iwhere it is finallysecured, and to beconnected to the boom. Boom 1 is raised by rotatingdrum 20 in a elockwiseidirection as viewed in Figs. 4 through 9 and islowered when drum Worm gear 22 is provided with a male fitting 29 whichis adapted to rotate the worm gear. The aforesaid windlass forcontrolling boom 1 mayI be operated by portable drill 30 having arecessed fitting 31 secured' thereon suitable for engaging male fitting29. Portable drill 30 should be provided with a reversible motor so thatit may be operated in onev direction to raise boom 1 and operated in'theopposite direction to lower boom 1. `Portable drill 30 may be of thepneumatic type as shown in the drawings ,Y in which eventAv it will beconnected by a suitable air hose 32 to a source of compressed air.

ln operating boom 1 from one side` (Fig. 4) toa horizontalor nestedposition on the other side `(Fig. 8) portable drill V30 is causedtorotate in a `clockwise direction as viewed in Figs. 4 and 5. Drum 20responds by also rotating in a clockwise direction whereupon boom 1 iscaused to raise. When boom 1 attains a vertical position the motor inportable drill 30 is reversed to provide for the lowering of boom 1. Toinitiate the lowering of boom-1, a slight force is imparted to the boomto move it beyond its vertical position. Secured to supporting member 7at the upper ends of opposite members 9 and 10 is a bar 4l) which has awheel 41 slidably mounted thereon. When boom 1 is operated to its otherside (Figs. 6, 7 and 8) boom line 23 rides in wheel 41.

Supporting frame 7 is provided with another windlass 52 comprising drum42, gear wheel 43, andvworm gear 44. Drum 42 has a line 45 wound thereonwhich line` extends over a pulley 46 which is pivotally mounted at 50upon triangular plate 26. Line 45 is provided at the end thereof withtheusual type of lifting hook 47. Worm gear 44 is provided with a malefitting 48 which is adapted for engagement by the recessed tting 31secured upon portable drill't), thus enabling portable drill 30 tooperate both windlasses. When drum 42 is caused to rotate in a clockwisedirection (Figs. 4 to 9) lifting hook 47 and any load to which it issecured is caused to move upwardly. When drum 42 is moved in acounterclockwise direction, hook 47 and anyV load to which it might beattached is moved downwardly. When boom 1 is moved from one side asviewed in Figs. 4 and 5 of supporting frame 7 to its other side asviewed in Figs. 6 and 7 with boom 1 from the one side of supportingframe 7 to its other side, the hook and load remaining in a verticalposition at all times. Windlass 52 is of course operable with the boomon its other side to raise and lower lifting hook 47. Boom 1 may have aplurality of encaged floodlights 48 secured at its converging ends whichare directed in the direction of hook 47. Floodlights 48 are connectedin the usual manner through suitable conduits encased within members 2and 3 to pigtails 49.

As already noted, supporting frame 7 is pivotally connected at 4 to baseplate 5 which is secured upon machine shop floor 6. It has also beennoted that supporting frame 7 is secured in a normal operating positionby brace members 8 which are connected both to the supporting frame andto foundation 6. When boom 1 is operated to a horizontal position on itsother side (Fig. 8), brace members 8 are disconnected from supportingframe 7 to permit supporting frame 7 to be pivoted to the left as viewedin Fig. 8. In this connection, it is to be noted that supporting frame 7is capable only of being pivoted in one direction, namely to the left asviewed in Fig. 8, the lower end of supporting frame 7 being especiallyformed for this purpose. The lower end of frame 7 accordingly has arounded end formed on one side and a square end on its other side. Ifdrum 20 of windlass 51 is rotated in a counterclockwise direction asviewed in Fig. 8 after boom 1 has attained its horizontal or nestedposition, supporting frame 7 is caused to pivot in a counterclockwisedirection as viewed in Fig. 8 until it attains a horizontal positionopposite from that of boom 1 (Fig. 9). Boom 1 is of sufficient weight topermit the supporting frame 7 to be lowered from its normal operatingposition to its horizontaloperating position without moving boom 1 fromits nested position.

It will now be apparent that I have provided a foldable hoist having aboom and supporting structure for the boom and wherein the boom may beoperated from one side of the supporting structure to a horizontal ornested position` on the other side of the supporting structure andwherein the supporting structure may be operated to a horizontalposition opposite from the boom after the boom has attained its nestedposition. It will be apparent also-that my foldable hoist may beoperated by a small portable drill or even by a hand crank from a singlelocation and by one man, and that because of the worm and gear wheeldriving mechanism incorporated into each windlass both the boom and anyload carried thereby will be maintained in the` positions to which theyhave been operated until intentionally moved therefrom.

Although I have herein shown and described only one form of myinvention, it is to be understood that various changes and modicationsmay be made therein within the scope of the appended claim withoutdeparting from the spirit and scope of my invention.

What I claim is:

In a foldable hoist, the combination of a base, a boom comprising spacedmembers, a supporting frame for the boom pivotally mounted at one end onthe base between said spaced members of the hoorn,` means separablyconnected to the supporting frame for securing the supporting frame in anormal vertical operating position, the boom members being pivotallymounted at one end on said base and the boom being swingable about itspivotal axis from a hoisting position at one side of the supportingframe about and over the supporting frame to a horizontal position onthe opposite side of the frame, the supporting frame being swingableabout its pivotal axis from its vertical normal yoperating position to ahorizontal position opposite to the boom when the latter is horizontal,a windlass mounted on said supporting frame, and gear including a cableand pulleys connecting the windlass to the boom for raising and loweringthe boom while the boom is at either side of the vertical supportingframe and for lowering the supporting frame to its horizontal positionwith the boom in' its horizontal position, said `gear including a cableguide mounted on said supporting frame between said windlass and thefree end of said supporting frame to guide said cable around the end ofsaid supporting frame when the boom is in the second-mentioned position,there being included in said gear a pulley connected to said boom, asecond pulley connected to said supporting frame between said windlassand the free end of said supportingframe, said cable having one endconnected to said boom and its other end connected to said windlass withthe intermediate portions of the cable passing from said windlass aroundthe first-mentioned pulley and thence around the second mentioned pulleyto said boom when the boom is in the rst-mentioned position, and saidcable also passing around said cable guide when the boom is in thesecond-mentioned position.

n References` Cited in the tile of this patent UNITED STATES PATENTS980,846 Sochor Ian. 3, 1911 987,455 Fischer Mar. 21, 1911 1,053,047Lewkowicz Feb. 11, 1913

